java -jar cfr.jar MyClass.class
jar xf myapp.jar # or unzip myapp.jar -d extracted/ decompile jar
jar tf myapp.jar | head -20 # Look for readable package names (com/mycompany) vs cryptic (a/b/c) java -jar cfr
java -jar procyon-decompiler.jar myapp.jar -o ./src decompile jar